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Welding Symbols

Understanding Welding SymbolsTerms and Definitions

Created By Jeffrey Rodenbarger Drake-Williams Steel

Omaha, Nebraska

Reference Line (Required element)

•Reference Line

Always Horizontal

Reference Line (Required element)

Arrow

Arrow Line

Reference Line (Required element)

Arrow

Tail

Tail

Reference Line (Required element)

Arrow

Tail

Reference Line must always be horizontal,

Arrow points to the line or lines on drawing which clearly identify the proposed joint or weld area.

The tail of the welding symbol is used to indicate the welding or cutting processes, as well as the welding specification, procedures, or the supplementary information to be used in making the weld.

Reference Line (Required element)

Arrow

Tail

Reference Line must always be horizontal,

Arrow points to the line or lines on drawing which clearly identify the proposed joint or weld area.

The tail of the welding symbol is used to indicate the welding or cutting processes, as well as the welding specification, procedures, or the supplementary information to be used in making the weld.

Basic components of a WELDING SYMBOL

Tail omitted when reference not used

Arrow connects reference line to arrow side member of joint or arrow side of joint

A circle at the tangent of the arrow and the reference line means welding to be all around.

All the way Around

A flag at the tangent of the reference line and arrow means Field Weld.

Field Weld Symbol

ARROW SIDE

OTHER SIDE

Weld Symbol Terminology

Break in arrow means arrow side must be side that beveling or other preparation required.

Fillet Weld (Arrow Side Only)

Fillet Weld (Other Side)

1/4

1/4

Size of Fillet Weld Noted

1/4

1/4

(5/16)

(5/16)

Depth of preparation or groove

Depth of penetration

Example of Double Bevel Groove weld

Plug or Slot Weld SymbolArrow Side

5/16

5/16

What does this symbol Represent?

5/16

5/16

Single-Bevel-Groove and Double Fillet Weld Symbol

Single-Bevel-Groove and Double Fillet weld Symbols

Chain Intermittent Fillet WeldWeld both sides each end and 10 inches center to center in between

1/4

1/4

2-10

2-10

10 in

Staggered Intermittent Fillet Weld

Weld ends than 10 inch centers staggered each side

10 in

10 in

2-102-101/4

1/4

S(E) L-P

F

A

R

(N)

Depth of bevel

Groove weld size

Finish Symbol Groove Angle included angle of countersink for plug welds

Root opening; Depth of filling for plug and slot welds.

Pitch(Center-to-center spacing) of welds

Number of spot, seam, stud, plug, slot, or projection welds

ARROW SIDEOTHER SIDE

FIELD WELD

Length of weld

The End